如何在WPF中重新编译空的DirectoryCatalog for MEF

我有这个步骤的应用程序：

• 启动应用程序和ConfigureAggregateCatalog

• 登录用户到应用程序

• 将DLL MEF模块下载到名为'Modules'的目录

• 刷新目录目录 - there is a problem

我有空目录'模块'后下载DLL我试图加载模块但没有成功 . 我在线上有一个错误，我称之为DirectoryCatalog.Refresh（）

System.ComponentModel.Composition.ChangeRejectedException未被用户代码处理Message =组合保持不变 . 由于以下错误，更改被拒绝：组合产生多个组合错误，有14个根本原因 . 根本原因如下 . 查看CompositionException.Errors属性以获取更多详细信息 . 1）由不可重组的导入阻止的导出变化'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleInitializer..ctor（Parameter =“downloadedPartCatalogs”，ContractName =“Microsoft.Practices.Prism.MefExtensions.Modularity.DownloadedPartCatalogCollection”）'部分'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleInitializer' . 2）部分'Microsoft.Practices上的不可重组导入'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager.mefFileModuleTypeLoader（ContractName =“Microsoft.Practices.Prism.MefExtensions.Modularity.MefFileModuleTypeLoader”）'阻止了导出的变化 . Prism.MefExtensions.Modularity.MefModuleManager” . 3）由不可重组的导入'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager..ctor（Parameter =“moduleInitializer”，ContractName =“Microsoft.Practices.Prism.Modularity.IModuleInitializer”）'阻止出口的变化'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager' . 4）部分'Microsoft.Practices'中不可重组的导入'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager.mefFileModuleTypeLoader（ContractName =“Microsoft.Practices.Prism.MefExtensions.Modularity.MefFileModuleTypeLoader”）'阻止了导出的变化 . Prism.MefExtensions.Modularity.MefModuleManager” . 5）由不可重组的导入'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager..ctor（Parameter =“moduleInitializer”，ContractName =“Microsoft.Practices.Prism.Modularity.IModuleInitializer”）'阻止出口的变化'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager' . 6）部分'GXBilling.ViewsModels.ShellViewModel'上的不可重组导入'GXBilling.ViewsModels.ShellViewModel.ModuleManager（ContractName =“Microsoft.Practices.Prism.Modularity.IModuleManager”）'阻止了导出的变化 . 7）发现多个导出匹配约束'（（exportDefinition.ContractName ==“Microsoft.Practices.Prism.Regions.RegionAdapterMappings”）AndAlso（exportDefinition.Metadata.ContainsKey（“ExportTypeIdentity”）AndAlso“Microsoft.Practices . Prism.Regions.RegionAdapterMappings” .Equals（exportDefinition.Metadata.get_Item（ “ExportTypeIdentity”））））” . 导致：无法设置导入'Microsoft.Practices.Prism.MefExtensions.Regions.Behaviors.MefDelayedRegionCreationBehavior..ctor（Parameter =“regionAdapterMappings”，ContractName =“Microsoft.Practices.Prism.Regions.RegionAdapterMappings”）'''部分'微软 . Practices.Prism.MefExtensions.Regions.Behaviors.MefDelayedRegionCreationBehavior” . 元素：Microsoft.Practices.Prism.MefExtensions.Regions.Behaviors.MefDelayedRegionCreationBehavior..ctor（Parameter =“regionAdapterMappings”，ContractName =“Microsoft.Practices.Prism.Regions.RegionAdapterMappings”） - > Microsoft.Practices.Prism.MefExtensions . Regions.Behaviors.MefDelayedRegionCreationBehavior - > AssemblyCatalog（Assembly =“Microsoft.Practices.Prism.MefExtensions，Version = 4.0.0.0，Culture = neutral，PublicKeyToken = 31bf3856ad364e35”）8）由不可重组的导入'Microsoft阻止的导出更改 . Practices.Prism.MefExtensions.Regions.MefSelectorRegionAdapter..ctor（Parameter =“regionBehaviorFactory”，ContractName =“Microsoft.Practices.Prism.Regions.IRegionBehaviorFactory”）'on'Microsoft.Practices.Prism.MefExtensions.Regions.MefSelectorRegionAdapter' . 9）由不可重组的导入'Microsoft.Practices.Prism.MefExtensions.Regions.MefItemsControlRegionAdapter..ctor（Parameter =“regionBehaviorFactory”，ContractName =“Microsoft.Practices.Prism.Regions.IRegionBehaviorFactory”）阻止出口的变化'Microsoft.Practices.Prism.MefExtensions.Regions.MefItemsControlRegionAdapter' . 10）由非重组导入'Microsoft.Practices.Prism.MefExtensions.Regions.MefContentControlRegionAdapter..ctor（Parameter =“regionBehaviorFactory”，ContractName =“Microsoft.Practices.Prism.Regions.IRegionBehaviorFactory”）阻止的出口变化'Microsoft.Practices.Prism.MefExtensions.Regions.MefContentControlRegionAdapter' . 11）找到多个与约束'（（exportDefinition.ContractName == . ）匹配的导出“Microsoft.Practices.Prism.Regions.IRegionViewRegistry”）AndAlso（exportDefinition.Metadata.ContainsKey（“ExportTypeIdentity”）AndAlso“Microsoft.Practices.Prism.Regions.IRegionViewRegistry”.Equals（exportDefinition.Metadata.get_Item（“ExportTypeIdentity”）） ））” . 导致：无法设置导入'Microsoft.Practices.Prism.MefExtensions.Regions.Behaviors.MefAutoPopulateRegionBehavior..ctor（Parameter =“regionViewRegistry”，ContractName =“Microsoft.Practices.Prism.Regions.IRegionViewRegistry”）''部分'微软 . Practices.Prism.MefExtensions.Regions.Behaviors.MefAutoPopulateRegionBehavior” . 元素：Microsoft.Practices.Prism.MefExtensions.Regions.Behaviors.MefAutoPopulateRegionBehavior..ctor（Parameter =“regionViewRegistry”，ContractName =“Microsoft.Practices.Prism.Regions.IRegionViewRegistry”） - > Microsoft.Practices.Prism.MefExtensions . Regions.Behaviors.MefAutoPopulateRegionBehavior - > AssemblyCatalog（Assembly =“Microsoft.Practices.Prism.MefExtensions，Version = 4.0.0.0，Culture = neutral，PublicKeyToken = 31bf3856ad364e35”）12）由不可重组的导入'Microsoft阻止的导出更改 . Practices.Prism.MefExtensions.Modularity.MefModuleInitializer..ctor（Parameter =“downloadedPartCatalogs”，ContractName =“Microsoft.Practices.Prism.MefExtensions.Modularity.DownloadedPartCatalogCollection”）'on'part.Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleInitializer ” . 13）部分'Microsoft.Practices上的非重组导入'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager.mefFileModuleTypeLoader（ContractName =“Microsoft.Practices.Prism.MefExtensions.Modularity.MefFileModuleTypeLoader”）'阻止了导出的变化 . Prism.MefExtensions.Modularity.MefModuleManager” . 14）由不可重组的导入'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager..ctor（Parameter =“moduleInitializer”，ContractName =“Microsoft.Practices.Prism.Modularity.IModuleInitializer”）'阻止出口的变化'Microsoft.Practices.Prism.MefExtensions.Modularity.MefModuleManager' . Source = System.ComponentModel.Composition StackTrace：位于System.ComponentModel.Composition.Holting.CatalogExportProvider的System.ComponentModel.Composition.Hosting.ExportProvider.OnExportsChanging（ExportsChangeEventArgs e）中的System.ComponentModel.Composition.CompositionResult.ThrowOnErrors（AtomicComposition atomicComposition） . OnCatalogChanging（Object sender，ComposablePartCatalogChangeEventArgs e）位于System.ComponentModel.Composition的System.ComponentModel.Composition.Hosting.AggregateCatalog.OnChanging（ComposablePartCatalogChangeEventArgs e）的System.ComponentModel.Composition.Hosting.ComposablePartCatalogCollection.OnChanging（Object sender，ComposablePartCatalogChangeEventArgs e） . 在System.ComponentModel.Composition.Hosting.DirectoryCatalog.Refresh的System.ComponentModel.Composition.Hosting.DirectoryCatalog.OnChanging（ComposablePartCatalogChangeEventArgs e）中的Hosting.ComposablePartCatalogCollection.OnContainedCatalogChanging（Object sender，ComposablePartCatalogChangeEventArgs e） （）在E：\ Projects中的GXBilling.Bootstrapper.RefreshCatalog（）！New！\ GXBilling \ GXBilling \ Bootstrapper.cs：E：\ Projects中GXBilling.ViewsModels.WinLogOnViewModel.FWCore_OnDownloadedModulesCompleted（Object sender，EventArgs e）的第36行！新的！\ GXBilling \ GXBilling \ ViewsModels \ WinLogOnViewModel.cs：BillingCore中的BillingCore.FWCore.FWCore_ModuleDownloadedCompleted（对象发送者，ModuleDownloadedEventArgs e）中的第168行：E！\ Projects！New！\ GXBilling \ BillingCore \ FWCore.cs：BillingCore中的第169行 . E：\ Projects中的FWCore.client_DownloadFileCompleted（Object sender，DownloadFileCompletedEventArgs e）！在E：\ Projects中的BillingCore.BillingServiceRef.FileTransferServiceClient.OnDownloadFileCompleted（对象状态）中的新！\ GXBilling \ BillingCore \ FWCore.cs：第207行！新！ GXBilling \ BillingCore \ Service References \ BillingServiceRef \ Reference.cs：System.Windows.Threading.ExceptionWrapper.InternalRealCall（Delegate callback，Object args，Int32 numArgs）中的第739行，位于MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen（对象源） ，System.Whows.Threading.DispatcherOperation.InvokeInSecurityContext（Object state）中的System.Windows.Threading.DispatcherOperation.InvokeImpl（）处于System.Threading.ExecutionContext.runTryCode（Object userData）的，Delegate方法，Object args，Int32 numArgs，Delegate catchHandler） ）在System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup（TryCode代码，CleanupCode backoutCode，对象的UserData）在System.Threading.ExecutionContext.RunInternal（的ExecutionContext的ExecutionContext，ContextCallback回调，对象状态）在System.Threading.ExecutionContext.Run（ExecutionContext中的ExecutionContext System.Windows.Threading.Dispatcher.ProcessQueue上System.Windows.Threading.DispatcherOperation.Invoke（）的System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback回调，对象状态），ContextCallback回调，对象状态，布尔值ignoreSyncCtx） （）在System.Windows.Threading.Dispatcher.WndProcHook（IntPtr在MS.Win32.HwndSubclass.DispatcherCallbackOperation（Object o）的MS.Win32.HwndWrapper.WndProc（IntPtr hwnd，Int32 msg，IntPtr wParam，IntPtr lParam，Boolean＆handling）的hwnd，Int32 msg，IntPtr wParam，IntPtr lParam，Boolean＆handling） System.Windows上的MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen（Object source，Delegate方法，Object args，Int32 numArgs，Delegate catchHandler）上的System.Windows.Threading.ExceptionWrapper.InternalRealCall（Delegate callback，Object args，Int32 numArgs） .Threading.Dispatcher.InvokeImpl（DispatcherPriority priority，TimeSpan timeout，Delegate方法，Object args，Int32 numArgs）位于MS.Win32.UnsafeNativeMethods的MS.Win32.HwndSubclass.SubclassWndProc（IntPtr hwnd，Int32 msg，IntPtr wParam，IntPtr lParam） . 在System.Windows上System.Windows.Window.ShowHelper（Object booleanBox）的System.Windows.Threading.Dispatcher.PushFrame（DispatcherFrame框架）的System.Windows.Threading.Dispatcher.PushFrameImpl（DispatcherFrame框架）中的DispatchMessage（MSG和msg） . System.Windows.Window.ShowDialog（）中的Window.Show（）InnerException：

部分代码由属性Import标记：

[Import]
public ShellViewModel ViewModel

[Import(AllowRecomposition = false)]
public IModuleManager ModuleManager { get; set; }

[Import(typeof(IShell), AllowRecomposition = true)]
public IShell MainShell { get; set; }

[ImportingConstructor]
public ModuleImporting(IRegionManager regionManager)

就这样 . 我没有IEnureable或IList等 . 在代码中 . 那么问题出在哪里？